Documentation: http://www.chartjs.org/docs/2.8.0/

Deprecations

• #5868 Deprecate Chart.{Type} classes
• #6022 Deprecate configMerge and scaleMerge helpers

Enhancements

• #5741 Add minBarLength option for bar chart. Thanks @adube
• #5780 Bar options are now scriptable
• #5841 Draw inner border for arc elements
• #5850 Add support for gridLines/angleLines borderDash for polar area and radar charts
• #5855 Moved drawing of radial lines before drawing the tick labels. Thanks @fhp
• #5885 Add support for hiding axis when all datasets are hidden. Thanks @davesalomon
• #5905 Add support for typed arrays
• #5908 Add midpoint interpolation to stepped line. Thanks @veggiesaurus
• #5927 Add reverse support to time scale
• #5938 Improve tick generation for linear scales
• #5951 New weight option for pie and doughnut charts
• #5960 Implement adapter to abstract date/time features
• #5966 Doughnut options are now scriptable
• #5973 Line options are now scriptable
• #5976 Polar area options are now scriptable
• #5978 Make moment optional from our UMD builds
• #5982 Remove date auto type conversions
• #6019 Improve time scale performances
• #6041 Radar options are now scriptable
• #6048 Move CSS in a separate file to be CSP-compliant
• #6059 Add onLeave callback to legend. Thanks @jonrimmer
• #6077 Allow configuration of borderWidth as object
• #6105 Optimize the npm package by removing useless files

Issues Fixed

• #5331 Make animation duration consistent across browsers. Thanks @serhii-yakymuk
• #5609 Fix offsetGridLine behavior with a single data point
• #5750 Ensure that the time scale safely accesses data.labels
• #5751 Handle axis lineWidth as an array
• #5752 Ensure that new Number() is correctly handled
• #5776 Fix legend layout padding at the start of columns. Thanks @jtagscherer
• #5786 Support decimal stepSize
• #5790 Add error margin for detecting if a point or line is in the chart area
• #5816 Fix legend item layout issue
• #5828 Improve shadow root detection. Thanks @karaxuna
• #5846 Correct calculation of padding in percent. Thanks @chtheis
• #5848 Fix radial scale topmost tick label and the bottom of the chart area that were cut off
• #5857 Fix nearest interaction mode
• #5858 Adjust the size of rectRounded/rectRot points to fit the circle with pointRadius
• #5865 Support CanvasGradient for hover colors
• #5869 Tooltip support for CanvasPattern and CanvasGradient
• #5880 Fix the rounding issue of floating point numbers in category scale
• #5884 Remove gaps on the left and right when the axis offset is set to true
• #5891 Remove autoSkip logic to always display last tick. Thanks @sgray
• #5909 Remove innerHTML usage from our DOM platform
• #5913 Re-allow modifying ticks in afterBuildTicks
• #5914 Add scale.pointLabels.lineHeight and scale.ticks.lineHeight options
• #5920 Return correct label for value type axis
• #5922 Properly calculate space needed by tick label when autoSkip is true
• #5925 Align title, body and footer inside tooltip
• #5933 Fix time scale ticks.reverse issue
• #5936 Fix "RangeError" exception when labels are big (>125000). Thanks @ckyycc
• #5937 Prevent Bezier points from being capped when a data point is off the chart
• #5947 Cast getRightValue to number in bar chart
• #5948 Fix ticks generation when working with tiny numbers
• #5963 Fix fitWithPointLabels calculation in radial linear scale
• #5996 Replace tooltip item xLabel and yLabel with label and value
• #6006 Enhance legend label color point when usePointStyle is true. Thanks @alfiehd
• #6007 Prevent drawing radial linear scale twice
• #6008 Supply correct start parameter to insertElements
• #6011 Prevent infinite resize when vertical scrollbar appears
• #6021 Fix padding of horizontal axes when labels are rotated
• #6027 Provide a rectangle getArea implementation for horizontal bars
• #6046 Rename addEventListener and removeEventListener
• #6058 Ignore invalid log scale min and max
• #6060 Handle frozen dataset.data arrays
• #6063 Fix responsive resize on RTL page

Documentation

• #5756 Add documentation the aspectRatio property. Thanks @danielcb29
• #5769 Use parser instead of the deprecated format option. Thanks @Niladri24dutta
• #5795 Document tick padding option. Thanks @JEphron
• #5796 Consistent use of punctuation. Thanks @bartdeslagmulder
• #5813 Add a link to chartjs-plugin-colorschemes
• #5831 Correct a spelling mistake. Thanks @bakert
• #5854 Add docs for barThickness. Thanks @jedrekdomanski
• #5876 Fix descriptions in bar chart doc
• #5877 Replace repeated function call with compact function, generateData. Thanks @generic-github-user
• #5912 Add omi-chart to the doc. Thanks @dntzhang
• #5915 Use HTTPS in documentation links where possible
• #5958 Use Chart.min.js in samples
• #5962 Update contributors guide and issue templates
• #5968 Fix contribution docs. Thanks @mojoaxel
• #5974 Add a note about maintainAspectRatio. Thanks @janelledement
• #5975 Fix typo / grammar in docs
• #5979 Fix labelOffset description
• #6013 Set pointBackgroundColor in radar sample
• #6020 Fix typos and minor doc issues
• #6026 Omit inconsistent note. Thanks @janelledement
• #6030 Update doc on label types for TooltipItem
• #6038 Fix duplicate anchor
• #6042 Add examples of scriptable charts. Thanks @janelledement
• #6053 Fix typo in broken url. Thanks @janelledement
• #6054 Simple spelling error fix. Thanks @JABedford
• #6070 Add a link to chartjs-plugin-crosshair. Thanks @AbelHeinsbroek
• #6073 Add instructions for image-based tests to the contributors guide
• #6079 Improve autoSkip documentation
• #6081 Add a link to chartjs-plugin-rough
• #6089 Improve financial sample tooltips and interactions
• #6096 Revamp the README.md and add link to the awesome list
• #6099 Fix document errors related to ticks
• #6107 Add a note about how to include an example against master

Development

• #5624 Radar code cleanup
• #5777 Support *.js test fixture configs
• #5794 Remove dead code from the gulpfile. Thanks @HendrikRoehm
• #5827 Change .editorconfig file to include newlines at EOF. Thanks @jtagscherer
• #5833 Use the pixel comparer for logarithmic tests. Thanks @jtagscherer
• #5840 Upgrade dev dependencies to reduce vulnerabilities
• #5842 Use short labels for the legend tests so as not to be affected by the font width
• #5871 Make Chart.controllers.* importable
• #5872 Fix test failures on Windows
• #5875 Remove gulp-connect and add jsdelivr/unpkg paths
• #5904 Migrate from Browserify to rollup
• #5953 Cleanup scales export for better import strategy
• #5965 Refactoring using helpers.options.resolve
• #5967 Update controller.scatter.test.js to test default tooltip callbacks. Thanks @Madrussian
• #5969 Make the main controller importable
• #5970 Remove unused parameter when calling removeResizeListener. Thanks @DanielRuf
• #5991 Trigger mouse events at the center of arc
• #5994 _resolveElementPoint utility for triggerMouseEvent
• #6005 Common logic for resolving element options
• #6017 Fix typo in comment
• #6032 Replace deprecated gulp-util and remove unused watchify
• #6033 Use lowercase for primitives in jsdocs
• #6040 Remove unused ESLint directive
• #6043 Autoskip cleanup
• #6061 Fix randomly failing tooltip test

Thanks to the maintainers and collaborators for their help to improve and test Chart.js (@nagix, @kurkle, @benmccann, @etimberg and @simonbrunel).

More details in the release PR: #6092